hard question mate. They are really testing you out for this. Its like a double edged sowrd, where if u ask for too much than they will get anoyed, but if u ask too little, than u will get anoyed. If I was you, I probably ask for the normal award wage perhaps?
Or maybe just be like the poticians and avoid the question, such as you are more keen to work longer hours and having the privlege of working for this company, which can at the same time make u seem like a better worker, who shows initiative and willigness to work more and want to contribute something to the company.
I hope that helped you out